| 摘要 |
An acoustical shield assembly and mating thread preguide unit include a series of acoustically insulated panels that substantially surround a sewing machine so as to be operative in attenuating any generated noise. A portion of the top panel, including a downwardly extending flange, is hinged to move between an opened position allowing access to the sewing machine and a closed position for mating with the preguide unit. The preguide unit is mounted to the sewing machine by a pair of adjustable mounting rods and includes two face plates spaced apart by means of a pair of spacer posts. Each face plate includes eyelets between the spacer posts for the passage of thread to the sewing machine. When the hinged portion of the top panel is closed, an elongated opening is formed between the downwardly extending flange and the top edge of the adjacent rear side panel of the shield assembly. The preguide unit is received in the opening with bearing surfaces of the spacer posts engaging both the downwardly extending flange and top edge of the rear side panel. The spacer posts serve to seal the ends of the elongated opening. Additionally, the exterior surface of the inner face plate seals against the interior surfaces of the downwardly extending flange and rear side panel adjacent the opening to provide maximum sound attenuation.
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